4.6.3.1 Except in free-fall lifeboats, a safety belt shall
be fitted at each indicated seating position. The safety belt shall be designed to hold
a person with a mass of 100 kg securely in place when the lifeboat is in a capsized
position. Each set of safety belts for a seat shall be of a colour which contrasts with
the belts for seats immediately adjacent. Free-fall lifeboats shall be fitted with a
safety harness at each seat in contrasting colour designed to hold a person with a mass
of 100 kg securely in place during a free-fall launch as well as with the lifeboat in
capsized position.
4.6.3.2 The stability of the lifeboat shall be
such that it is inherently or automatically self-righting when loaded
with its full or a partial complement of persons and equipment and
all entrances and openings are closed watertight and the persons are
secured with safety belts.
4.6.3.3 The lifeboat shall be capable of supporting
its full complement of persons and equipment when the lifeboat is
in the damaged condition prescribed in paragraph 4.4.1.1 and its stability shall be such that in the event of capsizing,
it will automatically attain a position that will provide an above-water
escape for its occupants. When the lifeboat is in the stable flooded
condition, the water level inside the lifeboat, measured along the
seatback, shall not be more than 500 mm above the seat pan at any
occupant seating position.
4.6.3.4 The design of all engine exhaust pipes,
air ducts and other openings shall be such that water is excluded
from the engine when the lifeboat capsizes and re-rights.